Heap-based buffer overflow in Microsoft Office for macOS and Microsoft Office - CVE-2026-110064
Published: November 11, 2026
Vulnerability identifier: #VU164778
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-110064
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the victim's system.
The vulnerability exists due to a heap-based buffer overflow in Microsoft Office Word when processing a malicious Office file. A remote attacker can send a specially crafted Office file and convince a user to open it to execute arbitrary code.
The Preview Pane is not an exploitation vector for this vulnerability.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-110064
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.115.26110837
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140